Dry shaver mechanism



Oct. 11, 1938. ,1. H. RAND, JR. El AL ECHANISM Oct. 11, 1938.

J. H. RANDQJR" ET AL DRY SHAVER MECHANISM Filed July 2, 1957 2Sheets-Sheet 2 James H. Rand, Jr. Russell E. Ben/zen m me och-11,19382,132,644

UNITED STATE James Henry Band, In, Stamford, Conn., and Russell E.Benner, Buifalo, N. Y., assignors, by mesne assignments, to GeneralShaver Corporation, Bridgeport, Conn., a corporation of DelawareApplication July 2, 1937, Serial No. 151,551

13 Claims. (01. 30-43) This invention relates to improvements in theshaving heads of dryshaving implements.

The general object of this invention is to provide a novel combinationof an outer shearing plate and an inner reciprocal hollow expansiblecutter held in cooperating contact therewith by means either in the formof a wedge or a spring.

A further object of this invention is to provide a wedge or spring meansfor expanding the hols PATENT OFFICE vide a comb for engagingand'guiding thehairs into the slots. Mounted within the bore of theouter member is the inner cutter which is shown in Figure 2substantially in the form of a thinwalled cylinder 8 which is providedwith a plurality of transverse slots which define the cutter bars 9 ofthe inner cutter. The cylindrical inner cutter 8 is preferably formedfrom a thin sheet 10 low cutter which is longitudinally split for enofsuitable steel into a cylinder which is longigagement with said means. 3tudinally slit along one side thereof with the ter- A further object ofthe invention is to provide mihal edges I0 turned inwardly, as is clearfrom a wedging or expanding means in such form that Figure 2, except atthe very ends where tabs l2 the motor operating mechanism may be conareleft which are only slightly inturned. 'The nected thereto for effectingreciprocation of the external diameter of the cylindrical inner cutterlo cutter. is substantially the same as the diameter of the These andother objects as will appear from bore in the outer member but issufliciently small the following disclosure are secured by means of asto be readily insertable thereinto. the invention herein. Lying betweenthe inturned or flanged edges This invention resides-substantiallyin thecom- I0 is a wedge-shaped block II which is short bination,construction, arrangement and relative enough so that it will just fitin between the. location of parts, all as will be. described in greaterlugs l2 to lock it against any relative longitudinal detail in thefollowing specification. movement with respect to the inner cutter. The

In the accompanying drawings, wedge member I l in cross-section has aform, as Figure 1 is across-sectional view showing some t is clear fromFigure 2, with its side walls con- 25 parts in elevation of a dry shaverhead converging upwardly and proportionedso as to en-- structed inaccordance with this invention; gage the inturned flanges Hi. It isprovided on Figure 2 is a cross-sectional view taken on the its lowersurface at about its longitudinal center line 2-2 of Figure 1; with arecess or groove I3 positioned 'to be en- Figure 3 is a view taken onthe line 3-3 of gaged by' the lever ll of the motor operated 30 Figure 1with some parts omitted; a driving mechanism, with the result that theFigure 4 is a view similar to that of Figure 1 of cutter and wedgemember which are locked toa modified mechanism; gether are conjointlyreciprocated. Disposed.

Figure 5 is a cross-sectional view taken on the On Opp Sides of the E S3 are the -\deline 5-5 of Figure 4; and pressions l5 which arepositioned to receive the 35 Figure 6 is a cross-sectional view taken onthe nds of t e p n s w i h e ur ed upline 66 of Figure 4 with some partsomitted. ird y m a s of p s 9- Th se sp ine- As illustrated in thedrawings, at I is aportion pressed plu ers act to force the wedge-shapeof the motor housing which is formed of any suitmem er I I tw h an s l0.t er y xable material into such a shape as to provide a, panding thecylindrical cutter 8 in the bore of the 40 device which can beconveniently held in and outer mem r t cause firm con act therebevmanipulated by hand. The upper end of thetween. This ensures the propercooperating housing is formed with a groove therein, as is pressurebetween the outer and the inner cutter apparent from Figure 2, in whichthe shaving bars. At one end of the wedge-shaped member head unit islocked, usually by means f s r w, a longitudinal groove I8 is formed onits bottom not shown. The shaving head comprisesan outer face in aposition to engage the head of a pin member comprising a block 2 ofsuitable steel I! mounted in the body portion 2 of the outer having alongitudinal bore therethrough to form member. This pin, cooperatingwith the. slot ill, the wall 3 which is provided with two series of actsto ensure rectilinear movement of the inner slots 4" extending in rowstherealong'on opposite cutter. At 3' is shown a pin molded in the hous-5 -.ing land positioned to engage a recess in the body portion 2 toproperly index the shaver head on the'end of the housing.

A modified structure is illustrated in Figures 4 to 6, inclusive. Thehousing and outer member sides of a central longitudinal line.- Theslots I form the cutter bars which may assume any suitable form andwhich by themselves form no part of this invention. As illustrated, theouter side faces of the thin wall 3 are cut away along the planes 6 toform the sharp corners 1 which procutter.

are of substantially the same construction as that previously described.In this case the inner cutter 28, which is again a thin-walled, hollow,substantially cylindrical member, is provided with a longitudinal splitalong one side. The terminal edges at the split are sharply curvedinwardly, as indicated at 30, and reversely curved outwardly, asindicated at 31!, to form transversely curved channels running down thelength thereof. At 32 is a channel-shaped spring member of open section,the terminal edges of which are curved outwardly, as indicated at 33, soas to engage with the curved ends 3i of the inner This spring member isso-constructed that it must be compressed transversely in order to snapit into the grooves formed by the curved ends 3i. It then acts inattempting to resume its normal shape to expand the hollow inner cutter28 in the bore of the outer member to ensure engagement therebetweenunder pressure. It is noted that the longitudinal length of the springmember 32 is less than that of the cylindrical member '38 so that itlies between the tabs ,36at each end of .the cylindrical member on each'side of the split to prevent relative longitudinal movement betweenthem. Secured by means of the rivets 35 at about the longitudinal centerof the spring member 32 is a block 34 which is provided with a groove 34on its bottom face-positioned to be engaged by the operating lever M.

In this construction it will be seen that the channel-shaped springmember 32 acts to expand the split inner cutter 28 in the opening of theouter shear plate so that its cutter bars 29 cooperate with the rearfaces of the cutter bars of the outer shear plate under pressure. Thismember also provides means ior connecting the inner cutter to the motordriving mechanism, thereby efiecting several functions with a simplifiedconstruction.

It will be apparent to those skilled in the art that both forms of innercutter illustrated are capable of being cut from sheets of suitablesteel and readily formed up into the desired shapes by means of massproduction methods, thereby greatly reducing the cost of manufacture.

Those skilled in the art will readily appreciate that the principles ofthe invention may be adapted in several physical forms without departurefrom the scope thereof. We do not, therefore, desire to be strictlylimited to the disclosure as given for purpose of illustration butrather to the appended claims.

What we seek to secure by Letters Patent is:

1. A dry shaver, comprising an outer slotted shear plate formed toprovide a housing, a longitudinal split tubular, transversely-slottedcutter within the housing, a member for efiecting reciprocation of theinner cutter, and means engaging the innercutter at the split andengaged by said operating member for effecting connection therebetweenand expanding the inner cutter against the inner wall of the housing.

2. A dry shaver, comprising an outer slotted shear plate formed toprovide a cylindrical inner Wall, an inner split tubular cutter havingcutter bars formed thereon, a member for effecting reciprocation of theinner cutter, and means engaging the inner cutter at the split andengaging said operating member for efiecting con nection therebetwecnand expanding the inner cutter against said cylindrical inner wall,said,

means being in the form of a wedge-shaped bar lying between the edges ofthe split inner cutter. 3. In a dry shaving device, the combinationcomprising an outer shear plate having cutter ,bars formed therein, saidshear plate having a cylindrical track therethrough, an inner reciprocalcutter mounted in said track comprising a thin-walled cylinder havingcutter bars formed thereon, said cylinder being slotted along one side,spring-pressed wedge means in said slot for expanding said cutter in thetrack, and an operating member connected to said wedge means.

4. In a dry shaving device, the combination comprising an outer shearplate having cutter bars formed therein, said shear plate having acylindrical track therethrough, an inner reciprocal cutter mounted insaid track comprising a thin-walled cylinder having cutter bars formedthereon, said cylinder being slotted along oneside,

wedge means in said slot for expanding said outter in the track, and anoperating member conhaving tabs at the ends of the slotsengaging theends of said wedge means to hold the wedge member against relativemovement with respect to the inner cutter.

5. In a dry shaving device, the combination comprising an outer shearplate having cutter bars formed therein, said shear plate having a theedges defining the slot being inturned, means engaging the inturnededges to expandthe inner cutter in the cylindrical track, and anoperating member engaging said means for reciprocating the inner cutter.

'7. In a dry shaving device, the combination comprising an outer shearplate having cutter 'bars formed therein, said shear platehaving acylindrical track therethrough, an inner reciprocal cutter mounted insaid track comprising a thin-Walled cylinder having cutter bars formed,

thereon, said cylinder being slotted along one side and the edges of theslot inturned, and resilient means engaging the inturned edges to expandthe inner cutter in the cylindrical track.

8. In a dry shaving device, the combination comprising an outer shearplate having cutter nected to said wedge means, said inner cutter barsformed therein, said shear plate having a cylindrical tracktherethrough, an inner reciprocal cutter mounted in said trackcomprising a thin-walled cylinder having cutter bars formed thereon,said cylinder being slotted along one side and the edges of the slotinturned, and resilient means engaging the inturned edges to expand theinner cutter in the cylindrical track,

- said resilient means comprising a channel-shaped member of springmaterial.

9. In a dry shaving device, the combination comprising an outer shearplate having cutter bars formed therein, said shear plate having acylindrical track therethrough, an inner reciprocal cutter mounted insaid track comprising a thinwalled cylinder having cutter bars formedthereon, said cylinder being slotted along one side and the edges of theslot inturned, and resilient means engaging the inturned edges toexpandthe inner cutter in the cylindrical track, said resilient springmaterial, the terminal edges being outturned to engage the inturnededges of theinner cutter.

10; In a dry shaving device, the combination comprising an outer shearplate having cutter bars formed therein, said shear plate having acylindrical track therethrough, an inner reciprocal cutter mounted insaid track comprising a thin-walled cylinder having cutter bars formedthereon, said cylinder being slotted along one side and the edges of theslot inturned, resilient means engaging the inturned edges to expand theinner cutter in the cylindrical track, said resilient means comprising achannel-shaped member of spring material, and an operating memberconnected to said means for reciprocating the inner cutter. d

11. In a dry shaving device, the combination comprising an outer shearplate having cutter bars formed therein, said shear plate having acylindrical track therethrough, an inner reciprocal cutter mounted insaid track comprising a thin-walled cylinder having cutter bars formedthereon, said cylinder being slotted along one side and the edges of theslot inturned, resilient means engaging the inturned edges toexpand theinner cutter in the cylindrical track. said resilient means comprising achannel-shaped member of spring material, the terminal edges beingoutturned to engage the inturned edges of the inner cutter, and anoperating member connected to i said means for reciprocating the innercutter.

12. A dry shaver of the type described, comprising an outer memberhaving a cylindrical bore forming athin wall slotted to form cutterbars, I .an inner hollow. cutter reciprocally mounted in' said borehaving cutter bars formed thereon, said inner cutter being slotted alongan element, means engaging the inner cutter in said. slot for expandingit, and means connected to said last means to effect reciprocation ofthe inner cutter.

13. A dry shaver of the type described, comprising an outer memberhaving a cylindrical bore forming a thin wall slotted to form cutterbars, an inner hollow cutter reciprocally mounted in said bore havingcutter bars formed thereon, said inner cutter being slotted along anelement, resilient means engaging the inner cutter in said slot forexpanding it, means connected to said last means to effect reciprocationof the inner cutter, said expanding means having a slot therein, and apin mounted on said outer member and engaging said slot to ensurerectilinear reciprocation of the inner cutter.

JAMES HENRY RAND, JR.

RUSSELL E. BENNER.

